Block Cell Phone Signal On Cruise Ship Limit Signal Transmitter
The Block Cell Phone Signal On Cruise Ship on the market can limit the mobile phone signal with a distance of 200 meters from the transmitter and a radius of > 20 meters. The shielding radius is adjustable, which only shields mobile phone signals and does not affect other electronic devices. Save power, the power is 20W. When the mobile phone is working, within a certain frequency range, the mobile phone and the base station are connected by radio waves to complete the transmission of data and sound with a certain baud rate and modulation method. For this communication principle, the scanning speed will cause garbled interference in the message signal received by the mobile phone, and the mobile phone cannot detect the normal data sent by the base station, so that the mobile phone cannot establish a connection with the base station. The mobile phone manifests as the phenomenon of searching the network, no signal, no service system, etc.
Common Cell Phone Jammer operating frequencies on the market: 869~894MHz; 825~960MHz; 1805~1890MHz, 1900~1990MHz, etc. The working frequency band is CDMA800, GSM900, DCS1800, PCS1900. It can control a range of about 40 meters in diameter, using a DC-DC converter input voltage and 5V output voltage. It was learned from the Rizhao Education Bureau that in order to prevent high-tech cheating and ensure the smooth progress of the college entrance examination, a quartz clock will be hung in each examination room of the college entrance examination this year. Candidates are not allowed to bring timers indoors. At the same time, the examination room will be equipped with metal detectors and use the latest epidemic prevention 3G Block Cell Phone Signal On Cruise Ship to maintain the fairness and impartiality of the examination. The Rizhao Education Bureau has taken a series of countermeasures against the increasingly rampant use of high-tech means of cheating and gang fraud in recent years. The main methods are: use the electronic monitoring equipment in the examination room to monitor the examination, and use the radio transmission detection vehicle outside the examination room. Quartz clocks are hung, and candidates are not allowed to bring timers into the venue.